Process of making solid stable compounds containing hydrogen peroxid.



UNITED STATES PATENT OFFICE VLADIMIR STANEK, 0F PRAGUE, AUSTRIA-HUNGARY, ASSIGNOR TO CHEMISCHE FABRIK GEDEON RICHTER, OF BUDAPEST, AUSTRIA9HUNGARY.

PROCESS OF MAKING SOLID STABLE COMPOUNDS CONTAINING HYDROGENIEROXID.

Patented Nov. 26, 1912.

No Drawing. Originalapplicatiori filed July 6, 1911, Serial No. 637,176. Divided and this application filed July 18, 1912. Serial n 710,242.

To all whom it may concern:

Be it known that I, VLADIMIR STANIIK, a subject of the -Emperor of Austria-Hungary, residing at Prague, Austria-Hungary, have invented certain new and useful Improvements in the Process of Making Solid Stable Compounds Containing Hydrogen Peroxid, of which the following is a specification.

The present application which is a division of my co-pen'ding application for Letters Patent filed July 6, 1911, Serial Number 637,176, relates to the production of solid stalzlle compounds containing hydrogen per- OX1 Tanatar has found that various organic substances oombine'with hydrogen peroxid to form solidcompounds. Such compounds may be formed with urea, acetamid, urethane, succinamid, asparagin, mannite, erythrite, pinacon and betain. All of these compounds behave, in aqueous solution, similar to hydrogen peroxid. However, they also decompose very quickly and for that reason their practical application is virtu ally impossible, because after -a very short time they split up to form water and oxygen. I have found that by the addition of small quantities of'acid salts of organic or inorganic acids these.compounds become very stable and for that reason are thoroughly suitable for practical application. For the preparation of a stable compound with a high percentage of hydrogen peroxid the urea has proven' to be particularly suitable. If urea be treated with a solution of hydrogen peroxid containing 30% H 0 on cooling the solution a compound crystallizes out the composition of which may be expressed by the formula:

This is an unstable compound, which be comesrvery stable by the addition thereto of a small quantity of an acid salt. For example, I have found that the addition of 0.3 per cent. of sodium bisulfate is quite suflicient to make the compound stable and'to permit of its being preserved for a long time, say 6 months and even longer.

The compound of urea with hydrogen pen oxid contains 34 to 35 per cent. H,O (the theory requires 36 per cent.) and is very easily soluble in water. The aqueous solution behaves exactly like a solution of hydrogen peroxid except that by the addition of the substances referred to for rendering the compound stable, its ready tendency to decompose is completely eliminated.

Solid hydrogen peroxid has been on the market for some time, in the form of por borates, persulfates and the like. In all these cases the compounds contain no more than 10 to 11 per cent. of hydrogen reroxid, whereas the compounds with the organiz: substances mentioned above and made stable according to the present invention, contain about 35 per cent. of hydrogen peroxid -Hydrogen'peroxid of such high concentra-- tion,'in solid and stable form has not; been known heretofore. By dissolving the preparation asolution of hydrogenperoxid can readily made at anytime, and it is evident that the facility with which the preparation may be shipped from place to place,-its high concentration, and the length'of time it may be preserved open quite new ways for the general application of hydrogen peroxid.

Example 1: 450 gr. of pulverized urea are introduced in 1000 gr. of an aqueous solution of hydrogen peroxid of 30% H O While the mass is vigorously stirred. The mixture is then cooled down to freezing point and the crystalline mass obtained is freed from water by suction and afterward intnnateiy mixed with 0.3% of dry sodium bisulfate s potassium bisulfate and ultimately dried at a temperature not exceeding 40 C.

Example 11: 1130 gr. of betain are :YIItTO" duced in an aqueous solution'ot' 1400 gr. of hydrogen perbxid of 30% H 0 The suintion is weakly acidified and evaporated t low temperature in comm until crystallization sets in. The crystallized compound is separated from themother liquor and made stable by mixing it -With 0.3% sodium bisulfate.

The compoundv of betain with hydrogen peroxid forms a white crystalline powder: easily soluble in water and has the formula ducing a stable compound of hydrogen per- In testimony whereof I have afiixed my oxid and urea, which comprises dissolving signature in presence of two witnesses.

ureain hydrogen proxidin'excess and add- VLADIMIR: STANEK- ing a small quantity of an acid salt;-

3. The herein described stable compound Witnesses:

of hydrogen peroxid and urea containing a. JAROSLAY MUHLBAUER,

small quantity of an acid salt. I

FERDINAND SCHULZ. 

